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We currently use the Bender IRDH 375 B Line insulation Monitor for determining insualtion health of cables to subsea equipment. We use voltages up to 990 V AC single phase 60 Hz.

I am looking for options to this unit if anyone knows of such.

Suggestions welcome, however we do need to relay an analogue reading of the LIM value and Alarm contact as with the Bender. The unit should be adaptive to the field conditions as we do have very long external cables to the subsea equipment.

First is this for UK railways? If yes bender is the only insulation monitor approved for Network Rail installations. You need to check with Bender or your NR contact that you have the correct units, as not all the range has approval.